From Things You Never Knew Existed: Possessed Books
Antique looking books seem perfectly harmless until someone walks by, then the middle book slides out toward the victim as if it will fall from the shelf. Books also emit spooky sounds for a totally haunted effect. 8″ x 8″ x 6.5″.
And they can be yours for a mere $24.98. This would be a cool library Halloween prank – said the geeky librarian.
Source: BoingBoing